CN110994777B - Double-circuit power supply circuit and mattress - Google Patents
Double-circuit power supply circuit and mattress Download PDFInfo
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- CN110994777B CN110994777B CN201911304485.2A CN201911304485A CN110994777B CN 110994777 B CN110994777 B CN 110994777B CN 201911304485 A CN201911304485 A CN 201911304485A CN 110994777 B CN110994777 B CN 110994777B
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- 230000005669 field effect Effects 0.000 claims description 22
- 238000002955 isolation Methods 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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Abstract
The invention relates to a double-circuit power supply circuit and a mattress, the double-circuit power supply circuit comprises: a controller, an OR gate circuit, a first supply circuit, a second supply circuit, and a NOT gate circuit or inverter, wherein: the controller is used for outputting a first signal when the preset mode is started and/or outputting a second signal when the electric quantity of the power supply of the second power supply circuit is smaller than a threshold value, and the first signal and the second signal are both high level; the OR gate circuit is connected with the controller, the first input end of the OR gate circuit is the input end of a first signal, and the second input end of the OR gate circuit is the input end of a second signal; the output end of the OR gate circuit is electrically connected with a first conducting switch of the first power supply circuit and is also electrically connected with a second conducting switch of the second power supply circuit through a NOT gate circuit or an inverter; the first conducting switch and the second conducting switch are both electrically connected with a load, the first conducting switch is configured to be conducted when the OR gate circuit outputs a high level, and the second conducting switch is configured to be conducted when the NOT gate circuit or the inverter outputs a high level.
Description
Technical Field
The invention relates to the technical field of smart homes, in particular to a double-circuit power supply circuit and a mattress.
Background
Along with the gradual increase of the influence of science and technology on the life of people, more and more intelligent devices enter the work and the life of people. For the intelligent mattress, the user is in a sleep state most of the time when using the mattress, and the user is very fragile at the moment and difficult to take timely measures to dangers in time. Therefore, the mattress is more in need of a safe power supply.
For example, for a user, the 220V commercial power far exceeds the range of the safe voltage that a human body can bear, and how to enable the power supply circuit to supply power to a load such as a mattress and ensure the power utilization safety is a technical problem that needs to be solved urgently in the technical field of smart homes at present.
Disclosure of Invention
In order to solve the technical problem of power supply safety of an existing mattress, the invention provides a double-path power supply circuit and a mattress, wherein corresponding first signals and second signals can be generated by judging the function use condition of the mattress and/or the electric quantity condition of a power supply of a second power supply circuit, the first signals and/or the second signals can realize flexible switching between the first power supply circuit and the second power supply circuit, for example, when a high-power function is started and/or the electric quantity of the power supply of the second power supply circuit is low, the first power supply circuit with higher voltage supplies power, and the second power supply circuit with lower voltage supplies power for most of other time, so that the safety of power supply of the mattress is improved, and the problem that a user cannot avoid the mattress in time due to danger in a sleep state is avoided.
According to a first aspect of the present invention, there is provided a two-way power supply circuit including: a controller, an OR gate circuit, a first supply circuit, a second supply circuit, and a NOT gate circuit or inverter, wherein:
the controller is used for outputting a first signal when a preset mode is started and/or outputting a second signal when the electric quantity of a power supply of the second power supply circuit is smaller than a threshold value, wherein the first signal and the second signal are both high-level signals;
the OR gate circuit is electrically connected with the controller, wherein a first input end of the OR gate circuit is an input end of the first signal, and a second input end of the OR gate circuit is an input end of the second signal;
the output end of the OR gate circuit is electrically connected with a first conducting switch of the first power supply circuit, and the output end of the OR gate circuit is also electrically connected with a second conducting switch of the second power supply circuit through the NOT gate circuit or the inverter;
the first conducting switch and the second conducting switch are both electrically connected with a load,
wherein the first turn-on switch is configured to turn on when the OR gate circuit outputs a high level, and the second turn-on switch is configured to turn on when the NOT gate circuit or the inverter outputs a high level.
Preferably, the first power supply circuit comprises a first power supply comprising 220V mains;
the power supply of the second power supply circuit is a second power supply which comprises a battery.
Preferably, the first power supply circuit further comprises a rectifier bridge, a first DC-DC circuit and an isolation circuit, wherein:
the first power supply is electrically connected with the first conduction switch sequentially through the rectifier bridge, the first DC-DC circuit and the isolation circuit.
Preferably, the two-way power supply circuit further includes a charging circuit, wherein:
the input end of the charging circuit is electrically connected with the isolation circuit, and the output end of the charging circuit is electrically connected with the second power supply.
Preferably, the first power supply circuit further includes a first voltage dividing resistor, and the first voltage dividing resistor is connected in series between the isolation circuit and the first conducting switch.
Preferably, the second power supply circuit further comprises a second DC-DC circuit, wherein:
the second power supply is electrically connected to the second conduction switch through the second DC-DC circuit.
Preferably, the second power supply circuit further includes a second voltage-dividing resistor connected in series between the second DC-DC circuit and the second conducting switch.
Preferably, the first conduction switch comprises a first field effect transistor, and the second conduction switch comprises a second field effect transistor.
Preferably, the two-way power supply circuit further includes a first drive circuit and a second drive circuit, wherein:
the input end of the first driving circuit is electrically connected with the output end of the OR gate circuit, and the output end of the first driving circuit is electrically connected with the grid electrode of the first field-effect tube, so that the signal output by the OR gate circuit can drive the first field-effect tube;
one of a source electrode and a drain electrode of the first field effect transistor is electrically connected with a load, and the other one of the source electrode and the drain electrode of the first field effect transistor is electrically connected with the first divider resistor;
the input end of the second driving circuit is electrically connected with the output end of the NOT gate circuit or the inverter, and the output end of the second driving circuit is electrically connected with the grid electrode of the second field effect transistor, so that the signal output by the NOT gate circuit or the inverter can drive the second field effect transistor;
one of a source and a drain of the second field effect transistor is electrically connected to a load, and the other is electrically connected to the second voltage dividing resistor.
According to a second aspect of the invention, there is provided a mattress comprising a two-way power supply circuit as described above.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the double-path power supply circuit and the mattress provided by the embodiment of the invention, the corresponding first signal and second signal can be generated by judging the functional use condition of the mattress and/or the electric quantity condition of the power supply of the second power supply circuit, and the first signal and/or the second signal can realize the flexible switching between the first power supply circuit and the second power supply circuit, for example, when the high-power function is started and/or the electric quantity of the power supply of the second power supply circuit is low, the first power supply circuit with higher voltage supplies power, and the second power supply circuit with lower voltage supplies power for most other time, so that the power supply safety of the mattress is improved, and the problem that a user cannot avoid the mattress in time due to danger in a sleep state is avoided.
In addition, compared with the existing double-path power supply circuit, the double-path power supply circuit provided by the embodiment of the invention is provided with the NOT gate circuit or the phase inverter, and the interlocking of the first power supply circuit and the second power supply circuit can be realized through the NOT gate circuit or the phase inverter, namely, only one path of power supply circuit can be ensured to supply power to the load at any time, so that the technical problems that the two paths of power supply circuits are simultaneously conducted and the double-path power supply is short-circuited due to the fact that no interlocking exists in the existing double-path power supply circuit and the circuit is greatly damaged are solved, the problems that the circuit is unstable and the circuit is damaged due to the fact that the two paths of power supply circuits are simultaneously conducted.
Further, compared with the existing double-circuit power supply circuit, the double-circuit power supply circuit provided by the embodiment of the invention is provided with the divider resistor between the power output end and the conduction switch MOS tube, and the requirement of the power supply on the withstand voltage value of the conduction switch MOS tube can be reduced by setting the divider resistor, so that the cost is reduced, and the stability of the circuit is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 schematically illustrates a two-way power supply circuit according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
The invention provides a double-circuit power supply circuit and a mattress, aiming at solving the technical problem of power supply safety of the existing mattress.
The inventive concept of the embodiment of the invention is as follows: for example, for a mattress, mains power is used when there is a high power function (e.g. massage function) on signal or a low battery signal, otherwise a low power supply (e.g. battery power) is used for most of the time. The high-power function starting signal or the battery power low signal is sent by the controller, for example, the sent signal acts on the double-circuit power supply circuit, so that the switching between high-power supply and low-power supply is realized, the mattress is ensured to be in low-power supply (such as battery power supply) in most of the service time, and the safety of the mattress power supply is improved.
Fig. 1 schematically illustrates a two-way power supply circuit according to an embodiment of the present invention. As shown in fig. 1, the two-way power supply circuit includes: a controller 101, an OR gate 102, a first power supply circuit 103, a second power supply circuit 104, and a NOT gate or inverter 105, wherein:
the controller 101 is configured to output a first signal when the preset mode is turned on and/or output a second signal when the power of the power supply of the second power supply circuit 104 is less than a threshold, where the first signal and the second signal are both high level signals.
In the embodiment of the present invention, the preset mode includes, for example, a higher power mode including a massage function mode for the mattress, but may also include other modes, and the present invention is not limited thereto. For example, when the preset mode is on, the power of the load is greater than or equal to 100 watts. In contrast, components such as sensors or communication modules typically operate from a few tenths of a watt to a few watts, which can be defined as low power.
Specifically, for the first signal, for example, when the controller 101 monitors that the preset mode is turned on, for example, the first signal with a high level is output through the first GPIO port. For the second signal, the controller 101 is, for example, electrically connected to the power supply of the second power supply circuit 104, and is configured to record the power amount of the power supply of the second power supply circuit 104, determine whether the power amount of the power supply of the second power supply circuit 104 is lower than a preset threshold, and output a high-level second signal through the second GPIO port, for example, when the power amount is lower than the preset threshold.
As shown in fig. 1, in order to switch the circuit by using a signal, the embodiment of the present invention uses an or gate circuit 102 to electrically connect with a controller 101. A first input of the or gate 102 serves, for example, as an input for a first signal, and a second input of the or gate 102 serves, for example, as an input for a second signal.
The output terminal of the or gate circuit 102 is electrically connected to the first on switch 106 of the first power supply circuit 103. The output terminal of the or gate circuit 102 is electrically connected to a second on switch 107 of the second power supply circuit 104 via a not gate circuit or an inverter 105.
As a switch connecting between the power supply terminal and the load, a first on-switch 106 and a second on-switch 107 are both electrically connected to the load, wherein the first on-switch 106 is configured to be turned on when the or gate circuit 102 outputs a high level, and the second on-switch 107 is configured to be turned on when the not gate circuit or the inverter 105 outputs a high level.
When the first conducting switch 106 is conducting, the first power supply circuit 103 supplies power to the load; when the second conducting switch 107 is conducting, the load is powered by the second power supply circuit 104.
As shown in fig. 1, the first power supply circuit 103 includes a first power supply 108, preferably, the first power supply includes 220V mains. The power source of the second power supply circuit is a second power supply 109, which preferably comprises a battery.
As shown in fig. 1, the embodiment of the present invention preferably performs dc power supply on a load, specifically: the first supply circuit 103 further comprises a rectifier bridge 110, a first DC-DC circuit 111 and an isolation circuit 112, wherein:
as one connection method, the first power supply 108 is electrically connected to the first conduction switch through the rectifier bridge 110, the first DC-DC circuit 111, and the isolation circuit 112 in this order.
As a more preferable connection mode, in order to reduce the requirement of the power supply on the withstand voltage of the on-switch, the first power supply circuit 103 further includes a first voltage dividing resistor 113, and the first voltage dividing resistor 113 is connected in series between the isolation circuit 112 and the first on-switch 106.
As shown in fig. 1, the second power supply circuit 104 further includes a second DC-DC circuit 114, wherein:
as a connection manner, the second power supply 109 is electrically connected to the second conduction switch 107 through the second DC-DC circuit 114.
As a more preferable connection mode, in order to reduce the requirement of the power supply for the withstand voltage value of the on-switch, the second power supply circuit 104 further includes a second voltage-dividing resistor 115, and the second voltage-dividing resistor 115 is connected in series between the second DC-DC circuit 114 and the second on-switch 107.
Furthermore, as shown in fig. 1, in order to facilitate charging of the second power supply 109, the dual power supply circuit further includes a charging circuit 116, wherein:
the input terminal of the charging circuit 116 is electrically connected to the isolation circuit 112, and the output terminal of the charging circuit 116 is electrically connected to the second power supply 109 for charging the second power supply 109.
Preferably, the first on switch 106 is a first field effect transistor, and the second on switch 107 is a second field effect transistor.
In order to make the signals output by the or gate circuit 102 and the not gate circuit or inverter 105 sufficient to drive the first conducting switch 106 and the second conducting switch 107, the two-way power supply circuit further includes a first driving circuit 117 and a second driving circuit 118.
The input end of the first driving circuit 117 is electrically connected to the output end of the or gate circuit 102, and the output end of the first driving circuit 117 is electrically connected to the gate of the first fet, so that the signal output by the or gate circuit 102 can drive the first fet;
preferably, one of the source and the drain of the first field effect transistor is electrically connected to the load, and the other is electrically connected to the first voltage dividing resistor 113.
The input end of the second driving circuit 118 is electrically connected to the output end of the not gate circuit or the inverter 105, and the output end of the second driving circuit 118 is electrically connected to the gate of the second field effect transistor, so that the signal output by the not gate circuit or the inverter 105 can drive the second field effect transistor;
preferably, one of the source and the drain of the second field effect transistor is electrically connected to the load, and the other is electrically connected to the second voltage dividing resistor 115.
For convenience of understanding, the following describes a switching process of the dual power supply circuit provided by the embodiment of the present invention:
for example, when at least one of the first signal and the second signal exists, the or gate circuit 102 outputs a high level 1, and the first fet is turned on by the first driving circuit 117, so that the load is supplied by the first power supply circuit 103 (e.g., commercial power). Since the inverter 105 outputs a low level 0, the second fet is turned off, and the second power supply circuit 104 is disconnected from the load.
For example, when neither the first signal nor the second signal is present, the or gate 102 outputs a low level of 0, so the first fet is not conducting, while the not gate or inverter 105 outputs a high level of 1, driven by the second driver circuit 118, and the second fet is conducting, so that the load is powered by the second power supply circuit 104 (e.g., a battery).
Correspondingly, the embodiment of the invention also provides a mattress, which comprises the double-circuit power supply circuit.
Wherein the mattress is for example a smart mattress.
In summary, the embodiments of the present invention provide a dual-path power supply circuit and a mattress, which can generate a corresponding first signal and a second signal by determining a functional usage condition of the mattress and/or an electric quantity condition of a power supply of a second power supply circuit, and the first signal and/or the second signal can implement flexible switching between the first power supply circuit and the second power supply circuit, for example, when a high power function is turned on and/or the electric quantity of the power supply of the second power supply circuit is low, the first power supply circuit with a higher voltage supplies power, and the second power supply circuit with a lower voltage supplies power for most of other time, so that the safety of supplying power to the mattress is improved, and the problem that a user cannot avoid the mattress in time due to danger in a sleep state is avoided.
In addition, compared with the existing double-path power supply circuit, the double-path power supply circuit provided by the embodiment of the invention is provided with the NOT gate circuit or the phase inverter, and the interlocking of the first power supply circuit and the second power supply circuit can be realized through the NOT gate circuit or the phase inverter, namely, only one path of power supply circuit can be ensured to supply power to the load at any time, so that the technical problems that the two paths of power supply circuits are simultaneously conducted and the double-path power supply is short-circuited due to the fact that no interlocking exists in the existing double-path power supply circuit and the circuit is greatly damaged are solved, the problems that the circuit is unstable and the circuit is damaged due to the fact that the two paths of power supply circuits are simultaneously conducted.
Further, compared with the existing double-circuit power supply circuit, the double-circuit power supply circuit provided by the embodiment of the invention is provided with the divider resistor between the power output end and the conduction switch MOS tube, and the requirement of the power supply on the withstand voltage value of the conduction switch MOS tube can be reduced by setting the divider resistor, so that the cost is reduced, and the stability of the circuit is improved.
Those skilled in the art will appreciate that the modules or steps of the invention described above can be implemented in a general purpose computing device, centralized on a single computing device or distributed across a network of computing devices, and optionally implemented in program code that is executable by a computing device, such that the modules or steps are stored in a memory device and executed by a computing device, fabricated separately into integrated circuit modules, or fabricated as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A dual supply circuit, comprising: a controller, an OR gate circuit, a first supply circuit, a second supply circuit, and a NOT gate circuit or inverter, wherein:
the controller is used for outputting a first signal when the massage function mode is started and/or outputting a second signal when the electric quantity of the power supply of the second power supply circuit is smaller than a threshold value, wherein the first signal and the second signal are both high-level signals, the power supply of the second power supply circuit is a second power supply, and the second power supply comprises a battery;
the OR gate circuit is electrically connected with the controller, wherein a first input end of the OR gate circuit is an input end of the first signal, and a second input end of the OR gate circuit is an input end of the second signal;
the output end of the OR gate circuit is electrically connected with a first conduction switch of the first power supply circuit, and the output end of the OR gate circuit is also electrically connected with a second conduction switch of the second power supply circuit through the NOT gate circuit or the phase inverter, wherein the first power supply circuit comprises a first power supply, and the first power supply comprises 220V mains supply;
the first conducting switch and the second conducting switch are both electrically connected with a load,
wherein the first turn-on switch is configured to turn on when the OR gate circuit outputs a high level, and the second turn-on switch is configured to turn on when the NOT gate circuit or the inverter outputs a high level.
2. The dual supply circuit of claim 1, wherein the first supply circuit further comprises a rectifier bridge, a first DC-DC circuit, and an isolation circuit, wherein:
the first power supply is electrically connected with the first conduction switch sequentially through the rectifier bridge, the first DC-DC circuit and the isolation circuit.
3. The dual supply circuit of claim 2, further comprising a charging circuit, wherein:
the input end of the charging circuit is electrically connected with the isolation circuit, and the output end of the charging circuit is electrically connected with the second power supply.
4. The dual power supply circuit of claim 2, wherein the first power supply circuit further comprises a first voltage dividing resistor connected in series between the isolation circuit and the first conducting switch.
5. The dual supply circuit of claim 4, wherein the second supply circuit further comprises a second DC-DC circuit, wherein:
the second power supply is electrically connected to the second conduction switch through the second DC-DC circuit.
6. The dual supply circuit of claim 5, wherein the second supply circuit further comprises a second voltage divider resistor connected in series between the second DC-DC circuit and the second conducting switch.
7. The dual supply circuit of claim 6, wherein the first conducting switch comprises a first fet and the second conducting switch comprises a second fet.
8. The dual supply circuit of claim 7, further comprising a first drive circuit and a second drive circuit, wherein:
the input end of the first driving circuit is electrically connected with the output end of the OR gate circuit, and the output end of the first driving circuit is electrically connected with the grid electrode of the first field-effect tube, so that the signal output by the OR gate circuit can drive the first field-effect tube;
one of a source electrode and a drain electrode of the first field effect transistor is electrically connected with a load, and the other one of the source electrode and the drain electrode of the first field effect transistor is electrically connected with the first divider resistor;
the input end of the second driving circuit is electrically connected with the output end of the NOT gate circuit or the inverter, and the output end of the second driving circuit is electrically connected with the grid electrode of the second field effect transistor, so that the signal output by the NOT gate circuit or the inverter can drive the second field effect transistor;
one of a source and a drain of the second field effect transistor is electrically connected to a load, and the other is electrically connected to the second voltage dividing resistor.
9. A mattress comprising a dual power supply circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304485.2A CN110994777B (en) | 2019-12-17 | 2019-12-17 | Double-circuit power supply circuit and mattress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304485.2A CN110994777B (en) | 2019-12-17 | 2019-12-17 | Double-circuit power supply circuit and mattress |
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| CN110994777A CN110994777A (en) | 2020-04-10 |
| CN110994777B true CN110994777B (en) | 2021-04-23 |
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| CN201911304485.2A Active CN110994777B (en) | 2019-12-17 | 2019-12-17 | Double-circuit power supply circuit and mattress |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111463872B (en) * | 2020-06-02 | 2022-07-12 | 无锡睿勤科技有限公司 | Charging protection circuit and method for multiple charging interfaces and terminal |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2532508B1 (en) * | 1982-08-30 | 1986-09-12 | Radulescu Alexandre | HEATING SHEET |
| CN201302086Y (en) * | 2008-11-25 | 2009-09-02 | 叶超 | A power supply system with double power sources for LED street lamp |
| CN201490911U (en) * | 2009-06-18 | 2010-05-26 | 群光电能科技股份有限公司 | Electricity-saving power supply device with battery module |
| GB0911005D0 (en) * | 2009-06-25 | 2009-08-12 | Gnjatovic Ljubomir | Bed systems |
| CN103457346B (en) * | 2012-06-01 | 2017-06-27 | 研祥智能科技股份有限公司 | A kind of power-supply system and its power supply redundancy control circuit |
| CN106331403A (en) * | 2015-06-19 | 2017-01-11 | 重庆尊来科技有限责任公司 | Two-state controller adapting to face width |
| CN208015444U (en) * | 2018-01-30 | 2018-10-26 | 广州小鹏汽车科技有限公司 | A kind of vehicle-mounted data terminal power supply switch circuit |
| CN209488453U (en) * | 2018-12-19 | 2019-10-11 | 深圳市菲菱科思通信技术股份有限公司 | The dual output POE power supply circuit of multi-operation mode |
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